added test stage in jenkinsfile

automation/Dockerfile

@@ -7,4 +7,8 @@ RUN apt-get --yes upgrade
 # tzdata is a dependency, won't install otherwise
 ARG DEBIAN_FRONTEND=noninteractive
 
+# set CROSS_CONTAINER_IN_CONTAINER to inform `cross` that it is executed from within a container
+ENV CROSS_CONTAINER_IN_CONTAINER=true
+
 RUN rustup component add rustfmt clippy
+RUN cargo install cross